Nikon F4S - Meter Coupling Lever

METER COUPLING LEVER
Before mounting a non-A! Nikkor Jens, be sure to push the
meter coupling lever release button and set the meter coupling
lever in the “up” position. Then perform stop-down exposure
metering (see page 59).
Stop-down exposure metering cannot be performed in Spot
Metering.
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nr pry ne ke
AO ANA TA TN ATT NT, RA; CTRA A A Jr.